Study on the scheme optimum selection of rooms and pillars stoping of complex goaf in Gacun silver polymetallic mine

In this paper, the basic requirements and technical features of pillar recovery method are analyzed and studied, and taking the pillar of No.4206 stope in Gacun silver polymetallic mine as an example, the authors combine with empty zones of No.4206 stope, engineering layout and jambs of backstopping, propose three different schemes:backfill mining, sublevel caving, major blasting.Besides, it also briefly discusses the cutting engineering layout and stoping technique of schemes.At last, after conducing comparative analysis, production cost and requirement analysis, production planning and requirement analysis, the third scheme is determined as the most optimum, applying it in production.